Allerton 2015 Paper Abstract

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Paper ThD4.4

Farthofer, Stefan (Vienna University of Technology), Matz, Gerald (Vienna University of Technology)

Linear Superposition Coding for the Gaussian MAC with Quantized Feedback

Scheduled for presentation during the Regular Session "Coding Techniques and Applications II" (ThD4), Thursday, October 1, 2015, 16:30−16:50, Pine

53rd Annual Allerton Conference on Communication, Control, and Computing, Sept 29-Oct 2, 2015, Allerton Park and Retreat Center, Monticello, IL, USA

This information is tentative and subject to change. Compiled on November 19, 2019

Keywords Coding Techniques and Applications, Information Theory

Abstract

We propose a linear transceiver scheme for the symmetric two-user multiple access channel with additive white Gaussian noise and quantized feedback. The quantized feedback link is modeled as an information bottleneck subject to a rate constraint. We introduce a superposition scheme that splits the transmit power of each user between an Ozarow-like code (designed for perfect rate-limited feedback) and a conventional code that ignores the feedback. We study the achievable sum rate as a function of the feedback quantization rate and we show that sum rate maximization leads to a difference of convex functions problem that we solve via the convex-concave procedure.

 

 

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